close gaps in VRAM mapping

1 files changed, 12 insertions, 0 deletions

diff --git a/src/GPU.cpp b/src/GPU.cpp
index 6651c2a..47a69cc 100644
--- a/src/GPU.cpp
+++ b/src/GPU.cpp
@@ -529,6 +529,8 @@ u8* GetUniqueBankPtr(u32 mask, u32 offset)
 
 void MapVRAM_AB(u32 bank, u8 cnt)
 {
+    cnt &= 0x9B;
+
     u8 oldcnt = VRAMCNT[bank];
     VRAMCNT[bank] = cnt;
 
@@ -587,6 +589,8 @@ void MapVRAM_AB(u32 bank, u8 cnt)
 
 void MapVRAM_CD(u32 bank, u8 cnt)
 {
+    cnt &= 0x9F;
+
     u8 oldcnt = VRAMCNT[bank];
     VRAMCNT[bank] = cnt;
 
@@ -671,6 +675,8 @@ void MapVRAM_CD(u32 bank, u8 cnt)
 
 void MapVRAM_E(u32 bank, u8 cnt)
 {
+    cnt &= 0x87;
+
     u8 oldcnt = VRAMCNT[bank];
     VRAMCNT[bank] = cnt;
 
@@ -733,6 +739,8 @@ void MapVRAM_E(u32 bank, u8 cnt)
 
 void MapVRAM_FG(u32 bank, u8 cnt)
 {
+    cnt &= 0x9F;
+
     u8 oldcnt = VRAMCNT[bank];
     VRAMCNT[bank] = cnt;
 
@@ -831,6 +839,8 @@ void MapVRAM_FG(u32 bank, u8 cnt)
 
 void MapVRAM_H(u32 bank, u8 cnt)
 {
+    cnt &= 0x83;
+
     u8 oldcnt = VRAMCNT[bank];
     VRAMCNT[bank] = cnt;
 
@@ -891,6 +901,8 @@ void MapVRAM_H(u32 bank, u8 cnt)
 
 void MapVRAM_I(u32 bank, u8 cnt)
 {
+    cnt &= 0x83;
+
     u8 oldcnt = VRAMCNT[bank];
     VRAMCNT[bank] = cnt;